Be Cool's high-torque electric fans offer a powerful, consistent cooling airflow regardless of engine RPM. This compares very favorably to an engine-driven fan's output, which is limited by engine RPM. At slow driving speeds, such as during a cruise or a parade, an engine-driven fan is producing the least airflow when your engine actually needs more cooling air. Be Cool fans not only provide the airflow needed by your cooling system at low speeds but, in most cases, they also allow for the removal of a vehicle's engine-driven fan which can result in a significant horsepower gain as well as fuel savings.